Canada had its own flag in addition to the Union Jack between 1868 and 1965. A fairly typical British colonial flag - similar to British Hong Kong [1, 2], Australia, New Zealand, Cape Colony, etc. - with the Union Jack in the canton (upper-left quadrant) against a red background with a coat of arms in the bottom-right varying based on who was part of Canada at any given time. [3]

[1] Illustration: https://en.wikipedia.org/wiki/Flag_of_Hong_Kong_(1959–1997)#...

[2] During Protests: https://en.wikipedia.org/wiki/Flag_of_Hong_Kong_(1959–1997)#...

[3] https://en.wikipedia.org/wiki/Flag_of_Canada#/media/File:Can...